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Bijie borders Zunyi to the east, Anshun and Liupanshui to the south, Zhaotong and Qujing (Yunnan) to the west, and Luzhou (Sichuan) to the north. It spans latitude 26°21′−27°46′ N and longitude 105°36′−106°43′ E, and is marked heavily by the presence of the Wumeng Mountains (乌蒙山) as well as karst topography. The Wu, Beipan, and Chishui Rivers are the most important rivers that originate here. The highest elevation is Jiucaiping (韭菜坪), at 2,900.6 m (9,516 ft), on the border of Hezhang and Weining counties.

Due to its low latitude and elevation above 1,700 m (5,600 ft), Bijie has a monsoon-influenced subtropical highland climate (KöppenCwb), bordering on a humid subtropical climate (Köppen Cwa) with very warm, rainy summers and cool, damp winters. The monthly 24-hour average temperature ranges from 2.7 °C (36.9 °F) in January to 21.6 °C (70.9 °F) in July, while the annual mean is 12.77 °C (55.0 °F). Rainfall is very common year-round, occurring on 206 days of the year, but over half of the annual total (900 mm or 35.4 in) occurs from June to August. With monthly percent possible sunshine ranging from 15% in January to 44% in August, the city receives 1,218 hours of bright sunshine annually; spring is sunnier and features warmer daytime temperatures than autumn.

According to the 2010 Sixth National Census, Bijie City had a permanent resident population of 6,536,370, an increase of 208,899 (3.3% or 0.33% annually), 3,400,195 (52.02%) of which were male, producing a male-female ratio of 108.42:100. Children aged 0−14 numbered 2,029,934人 (31.06%), persons aged 15−64 numbered 4,018,583 (61.48), and seniors 65+ numbered 487,853 (7.46%). The urban population stood at 1,711,222 (26.18%). Persons of Han ethnicity numbered 4,824,015 (73.80%), while minorities formed the other 26.20%.